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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLIfNode.java @ 13882:afd6fa5e8229

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SL: Feedback from reviewers
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 05 Feb 2014 08:02:15 -0800
parents f9b934e1e172
children a08b8694f556
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1 /*
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.sl.nodes.controlflow;
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24
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25 import com.oracle.truffle.api.dsl.*;
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26 import com.oracle.truffle.api.frame.*;
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27 import com.oracle.truffle.api.nodes.*;
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28 import com.oracle.truffle.api.utilities.*;
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29 import com.oracle.truffle.sl.nodes.*;
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30
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31 @NodeInfo(shortName = "if")
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32 public final class SLIfNode extends SLStatementNode {
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33
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34 /**
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35 * The condition of the {@code if}. This in a {@link SLExpressionNode} because we require a
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36 * result value. We do not have a node type that can only return a {@code boolean} value, so
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37 * {@link #evaluateCondition executing the condition} can lead to a type error.
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38 */
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39 @Child private SLExpressionNode conditionNode;
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40
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41 /** Statement (or {@SLBlockNode block}) executed when the condition is true. */
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42 @Child private SLStatementNode thenPartNode;
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43
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44 /** Statement (or {@SLBlockNode block}) executed when the condition is false. */
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45 @Child private SLStatementNode elsePartNode;
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46
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47 /**
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48 * Profiling information, collected by the interpreter, capturing whether the then-branch was
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49 * used (analogously for the {@link #elseTaken else-branch}). This allows the compiler to
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50 * generate better code for conditions that are always true or always false.
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51 */
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52 private final BranchProfile thenTaken = new BranchProfile();
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53 private final BranchProfile elseTaken = new BranchProfile();
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54
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55 public SLIfNode(SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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56 /*
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57 * It is a Truffle requirement to call adoptChild(), which performs all the necessary steps
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58 * to add the new child to the node tree.
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59 */
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60 this.conditionNode = adoptChild(conditionNode);
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61 this.thenPartNode = adoptChild(thenPartNode);
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62 this.elsePartNode = adoptChild(elsePartNode);
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63 }
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64
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65 @Override
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66 public void executeVoid(VirtualFrame frame) {
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67 if (evaluateCondition(frame)) {
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68 /* In the interpreter, record profiling information that the then-branch was used. */
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69 thenTaken.enter();
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70 /* Execute the then-branch. */
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71 thenPartNode.executeVoid(frame);
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72 } else {
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73 /* In the interpreter, record profiling information that the else-branch was used. */
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74 elseTaken.enter();
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75 /* Execute the else-branch (which is optional according to the SL syntax). */
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76 if (elsePartNode != null) {
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77 elsePartNode.executeVoid(frame);
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78 }
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79 }
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80 }
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81
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82 private boolean evaluateCondition(VirtualFrame frame) {
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83 try {
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84 /*
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85 * The condition must evaluate to a boolean value, so we call the boolean-specialized
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86 * execute method.
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87 */
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88 return conditionNode.executeBoolean(frame);
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89 } catch (UnexpectedResultException ex) {
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90 /*
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91 * The condition evaluated to a non-boolean result. This is a type error in the SL
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92 * program. We report it with the same exception that Truffle DSL generated nodes use to
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93 * report type errors.
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94 */
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95 throw new UnsupportedSpecializationException(this, new Node[]{conditionNode}, ex.getResult());
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96 }
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97 }
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98 }